Tribological behavior of NiCrB/α-Al₂O₃/Graphene nano particle coating by plasma spray method

This study concentrates on properties of plasma sprayed NiCrB/nano α-Al₂O₃/Graphene composite coating. The influence of coating thickness and particle concentration of nano Al₂O₃ and Graphene particles in the NiCrB matrix are considered as the parameters. To reveal the influence of the parameters on the quality characteristics of composite coating and to identify the optimal portfolio of parameters to fabricate high-quality functional NiCrB/nano α-Al₂O₃/Graphene composite coating, a RSM based GRA multi-objective optimization is proposed. Using the experimental results obtained by the 3-parameters in 5-level model the impact of these parameters on the specific wear rate by dry sliding, microhardness, erosive wear, and coefficient of friction is carried out. In addition, the surface roughness before and after the dry sliding wear is highlighted. A comprehensive analysis was conducted by GRA to optimize the parameters in order to obtain GRG and respective ranks. The results reveal optimum levels of 300 μ, 10 wt % and 0.8 wt % for coating thickness, Al₂O₃ and Graphene particle concentration.